Center-punch machine



(No Mddel.)

' R. S. PEABODY.

'GENTER PUNCH MACHINE.

No. 528,559. Patented Nov. 6, 1894.

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NITED STATES ATEN'T Prion.

CENTER-PUNCH MACHINE.

SPECIFICATION forming part of Letters PatentNo. 528,559, dated November6, 1894. 7

Application filed May 12,1894. smart. 511,016. (No model.)

To all whom it may concern:

Be it known that LROBERT SINGLETON PEA BODY, a citizen of the UnitedStates, residing at the city of Philadelphia, in the county of-Philadelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Center-Punch Machines, of which the following isa specification.

The principal object of my present inven tion is to provide a simple,durable, and automatic machine adapted to afford freedom of both handsof the operator for holding the work and to be readily released or setin motion for making a small mark or indentation such as is usuallyemployed for guiding drills and for other purposes and to this end myinvention consists of a center punch machine comprising the improvementshereinafter described and claimed.

The nature, characteristic features, and

scope of my invention will be more fully 1111-1 derstood from thefollowing description taken in connection with the accompanying drawing,forming part hereof and in which a machine embodying features of myinvention is illustrated partly in section and partly in elevation.

In the drawing, 1, is a main frame comprising, in the present instance,standards 2,

and a base 3.

4, is a yoke adjustable in respect to the standards 2, and provided witha sleeve or tubular guide 5, in which a center punch 6, is affordedfreedom ofvertical motion.

7, is a set screw by means of which the yoke at, may be clamped to placeat any required height.

8, is a hammer afforded a range of vertical motion and tending to strikethe upper end of the center punch 6.

9, is a spring tending to solicit the hammer 8, downward.

14, is a spring soliciting the upper end of the trigger lever into theposition shown.

The mode of operation of the hereinabove described device is as follows:The hammer 8,-is drawn upward with the result that the detent 12, isturned in the same direction and subsequently falls beneath the top ofthe hammer, whereby the latter is detained in elevated position. Thework upon which it is desired to make a center punch mark, is thenplaced beneath the lower end of the center punch 6. For this purpose,the yoke 4, may be adjusted upward or downward as required. The centerpunch 6, being free to slide in the sleeve 5, rests lightly upon thework, so that the latter may be shifted manually until the point of thecenter punch oecupies the required position. The Work may now be heldfirmly by both hands of the operator who touches the lower endof thetrigger lever 10, for example, with one finger. This motion of the lowerend of the trigger lever causes the upper end thereof to draw the detent12, clear of the hammer 8, whereupon the latter descends and strikes theupper end of the punch 6, with the result that the point of the punchmakes a slight indentation or punch mark upon the work. The force of thespring 9, may be increased or diminished by shifting the yoke 4, towhich it is attached, upward or downward.

It will be obvious to those skilled in the art to which my inventionappertains that modifications may be made in details without departingfrom the spirit thereof. Hence I do not limit myself to the preciseconstruction hereinabove set forth and illustrated in the accompanyingdrawings, but

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. A center punch machine comprising a main frame provided withstandards carrying a sleeve, a center punch movable in and guided bysaid sleeve, a hammer guided by said standards and tending to strikesaid punch, and trigger-and-detent connections for restraining andreleasing said hammer, substantially as described.

2. A' center punch machine comprising,

standards, a yoke adjustable in respect to In testimony whereof I havehereunto said standards and provided with a sleeve, a signed my name inthe presence of two Witcenter punch movable in said sleeve, a hamnesses.

mer, a spring for actuating said hammer, and ROBERT SINGLETON' PEABODY.

a trigger lever provided with detent connec- \Vitnesses:

tions for detaining said hammer in elevated CHARLES B. PEABODY,

position, substantially as described. A. B. STOUGHTON.

